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https://issues.apache.org/jira/browse/YARN-8865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16654588#comment-16654588
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Wilfred Spiegelenburg commented on YARN-8865:
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Fix for the check style issue I introduced.
The test failure is caused by the hashcode change as was explained in
YARN-5092. I will file a follow up jira to fix the check.
> RMStateStore contains large number of expired RMDelegationToken
> ---------------------------------------------------------------
>
> Key: YARN-8865
> URL: https://issues.apache.org/jira/browse/YARN-8865
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 3.1.0
> Reporter: Wilfred Spiegelenburg
> Assignee: Wilfred Spiegelenburg
> Priority: Major
> Attachments: YARN-8865.001.patch, YARN-8865.002.patch,
> YARN-8865.003.patch, YARN-8865.004.patch
>
>
> When the RM state store is restored expired delegation tokens are restored
> and added to the system. These expired tokens do not get cleaned up or
> removed. The exact reason why the tokens are still in the store is not clear.
> We have seen as many as 250,000 tokens in the store some of which were 2
> years old.
> This has two side effects:
> * for the zookeeper store this leads to a jute buffer exhaustion issue and
> prevents the RM from becoming active.
> * restore takes longer than needed and heap usage is higher than it should be
> We should not restore already expired tokens since they cannot be renewed or
> used.
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